{"id":"CVE-2026-88963","kind":"vulnerability","aliases":["CVE-2026-88963"],"related":[],"title":"Tutor LMS WordPress plugin: DOM XSS via redirect_url parameter","description":"The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to DOM-Based Cross-Site Scripting via the 'redirect_url' parameter in versions up to, and including, 4.0.8 This is due to insufficient input validation in the Topbar component's back button handler. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute in the victim's browser whenever the victim accesses a page that includes the malicious payload.","summary":"The Tutor LMS WordPress plugin up to and including 4.0.8 fails to validate the redirect_url parameter in its Topbar back button handler. An attacker can lure a user to a crafted link and run arbitrary JavaScript in the victim's browser.","severity":"medium","cvss":6.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","self-hosted","tutor-lms","wordpress"],"not_affected_if":["newer-version","plugin-not-installed"],"how_to_check":"- Check the installed Tutor LMS version in the WordPress admin plugins list or with `wp plugin get tutor --field=version`\n- unknown","fix":"- Update the Tutor LMS plugin to a version later than `4.0.8`; the patched version is unknown from the sources\n- unknown","status":"open","published_at":"2026-10-16T06:17:11+00:00","first_seen_at":"2026-10-23T21:57:12+00:00","triaged_at":"2026-10-25T04:04:20+00:00","updated_at":"2026-10-25T04:04:20+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T04:04:20Z","model":"claude-haiku-5-5","output":{"fix":"- Update the Tutor LMS plugin to a version later than `4.0.8`; the patched version is unknown from the sources\n- unknown","reach":"internet","title":"Tutor LMS WordPress plugin: DOM XSS via redirect_url parameter","impact":"medium","summary":"The Tutor LMS WordPress plugin up to and including 4.0.8 fails to validate the redirect_url parameter in its Topbar back button handler. An attacker can lure a user to a crafted link and run arbitrary JavaScript in the victim's browser.","category":"package","nicknames":[],"who_cares":["wordpress","tutor-lms","self-hosted"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker scripts run in victim browsers on the affected site","analyst_note":"","how_to_check":"- Check the installed Tutor LMS version in the WordPress admin plugins list or with `wp plugin get tutor --field=version`\n- unknown","needs_analyst":false,"not_affected_if":["plugin-not-installed","newer-version"],"who_is_affected":"Sites running the Tutor LMS plugin at version 4.0.8 or earlier are exposed when a logged-in or visiting user opens a page carrying the malicious redirect_url payload. Sites without Tutor LMS installed, or running a newer release, can skip it.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000593,"input_tokens":3387,"output_tokens":508,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-88963':13A,16A '4.0.8':34B,99C 'access':137C 'arbitrari':60B,124C 'attack':49B,121C 'back':45B,112C 'base':83C 'browser':66B,133C 'button':46B,113C 'compon':110C 'cours':73C 'craft':56B 'cross':85C 'cross-sit':84C 'cve':11A,14A 'dom':5A,82C 'dom-bas':81C 'due':102C 'elearn':70C 'execut':128C 'fail':35B 'handler':47B,114C 'host':20B 'includ':33B,98C,141C 'inject':123C 'input':105C 'insuffici':104C 'javascript':61B 'link':57B 'lms':2A,23B,27B,69C 'lure':51B 'make':116C 'malici':143C 'onlin':72C 'packag':17B 'page':139C 'paramet':10A,41B,92C 'payload':144C 'plugin':4A,29B,75C 'possibl':118C 'redirect':8A,39B,90C 'run':59B 'script':87C,126C 'self':19B 'self-host':18B 'site':86C 'solut':74C 'topbar':44B,109C 'tutor':1A,22B,26B,68C 'tutor-lm':21B 'unauthent':120C 'url':9A,40B,91C 'user':53B 'valid':37B,106C 'version':94C 'via':7A,88C 'victim':64B,131C,136C 'vulner':79C 'web':125C 'whenev':134C 'wordpress':3A,24B,28B,77C 'xss':6A","nicknames":[],"mitigations":[],"who_affected":"Sites running the Tutor LMS plugin at version 4.0.8 or earlier are exposed when a logged-in or visiting user opens a page carrying the malicious redirect_url payload. Sites without Tutor LMS installed, or running a newer release, can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T06:17:11+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cvss_by":"security@wordfence.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-88963","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88963","severity":null,"published_at":"2026-10-16T06:17:11+00:00","modified_at":"2026-10-16T15:17:33+00:00","first_seen_at":"2026-10-23T21:57:12+00:00","fetched_at":"2026-10-23T22:28:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}